Dipole sections of the LHC in the "LEGO" assembly hall.

Each section of the LHC has an incredible number of connections, most transport liquid helium for cooling and massive electricity in massive quantities to power superconducting electromagnets. The two capped tubes in the center carry the accelerated part

The stuff of nightmares, massive yellow entomological devices ready to scurry around and grab things (segments of the LHC for the most part, thankfully).

Reid surrounded by people, poster and door in background

The gravitational wave detector EXPLORER

One of the many informational tables around CERN during the open day

Kids enjoy the balloons I slaved over, fingers rubbed raw from tying-off, all afternoon. The little guy lost his moments later, but I quickly set him up with a shiny new one.